Themustang no5 is very nice. I dont think you can find it anywhere in bangkok. You can take beautiful pictures from inside to outside. Their service is very awesome, too. They helped us to organize a birthday cake for my gf. The cake was unbelieveablely yummy. If i have chance, i want to have the cake again. The location has a bit distance from the closest BTS, but it is easy to find it.
The bnb is suitable for youth, pet/ animal lover, but not suitable for aged, because you need walk upstair and downstair. They have two lovely cats walk freely in the Bnb.